Angular 2更改路由时保留服务实例

// my.service.ts
import { Injectable } from '@angular/core';

@Injectable()
export class MyService {
  // 保留的状态或数据
}

// my.guard.ts
import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { MyService } from './my.service';

@Injectable()
export class MyGuard implements CanDeactivate<any> {
  constructor(private myService: MyService) {}

  canDeactivate(): boolean {
    // 检查是否需要保留服务实例
    if (/* 需要保留 */) {
      return true;
    } else {
      return false;
    }
  }
}

// app-routing.module.ts
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { MyGuard } from './my.guard';

const routes: Routes = [
  {
    path: 'example',
    canDeactivate: [MyGuard],
    // 其他路由配置
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }